Sedimentary iron biogeochemistry

摘要: Sulfur is mainly fixed in sediments as iron sulfides and the biogeochemistry of aqueous solutions important to understanding processes involved interpreting sedimentary sulfides. Iron unusual that riverine Fe supply oceans form particulates. Equilibrium thermodynamic data for species confirm natural observations ferrhydrites goethite are dominant inorganic most non-sulfidic environments although siderite complex Green Rusts may specific systems. Dissolved generally operationally defined includes organic nanoparticulate Fe. In modern oxidized ocean waters dissolved present complexes which forms saccharide complexes. However, role anoxic systems has not yet been fully characterized. Reactive - readily reacts with sulfide an operationally-defined concept proved useful furthering The discovery Fe-reducing bacteria their widespread distribution meant more resistant phases contribute total reactive load. A combination chemical micro- macro- biological shelf results reduction Fe(III) efflux oceans. This shuttle explain relative abundance deeper, basinal sulfidic sediments.